x = int(input())

if x >= 30:
    print("Yes")
else:
    print("No") x = int(input()) x int(input()) int input() input if x >= 30:
    print("Yes")
else:
    print("No") x >= 30 x 30 print("Yes") print "Yes" print("No") print "No" x = int(input()) int(input()) x
x = int(input())

if x >= 30:
    print("Yes")
else:
    print("No")